austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1112 16-Channel LED Driver with Dot Correction and Greyscale PWM 1 General Description 2 Key Features 16 Channels The AS1112 is a 16-channel, constant current-sink LED driver. Each of the 16 channels can be individually adjusted by 4096-step Greyscale PWM Control: 12-Bit (4096 Steps) greyscale PWM brightness control and 64-step constant-current sink (dot correction). Dot Correction: 6-Bit (64 Steps) The dot correction circuitry adjusts the brightness variations between Drive Capability (Constant-Current Sink): 0 to 100mA the AS1112 channels and other LED drivers. Greyscale control and LED Power Supply Voltage: Up to 15V dot correction circuitry are accessible via the SPI-compatible serial interface. A single external resistor sets the maximum current value Supply Voltage Range: 3.0 to 5.5 V of all 16 channels. SPI-Compatible Serial Interface The open & short LED detection function indicates a broken, shorted or disconnected LED at one or more of the outputs. The overtemper- Controlled In-Rush Current ature flag indicates that the device is in an overtemperature condi- Data Transfer & PWM Clock Rate: up to 30 MHz tion. CMOS Level I/O Table 1. Standard Products Model Power-Down TEST pin Output Delay Diagnostic Features AS1112 Yes Connect to GND Yes - LED Open/Short Detection - Overtemperature Flag AS1112B No Connect to VCC Yes AS1112C No Connect to VCC No 32-pin TQFN 5x5 mm Package An additional power-down pin puts the AS1112 into a 40nA standby- 3 Applications mode. The AS1112 is available in a 32-pin TQFN 5x5 mm package. The device is ideal for mono-, multi-, and full-color LED displays, LED signboards, and display backlights. Figure 1. AS1112 - Block Diagram 1 CLK 2 SDI 32 LD 29 PD Constant Current 26 Control Max OUTn VREF = Driver Current 1.24V IREF 4 Greyscale 12-Bit Greyscale Delay* OUT0 0 Register 11 PWM Control x0 24 Dot Correction 6-Bit Dot Greyscale GSCLK Control 0 Register 5 Correction Counter 31 Input Open&Short LED Detection Shift OEN Register Constant Current Control Status Driver Open LED Detect, 5 Overtemperature Greyscale 12-Bit Greyscale Delay* OUT1 Flag, Dot 12 Register 23 PWM Control x1 Correction Data Dot Correction 6-Bit Dot . 3 6 Register 11 Correction . MODE . Open&Short LED Detection . 27 Open Thermal . LED Constant Current VCC Flag Control . Detect Driver Input 21 Shift Greyscale 12-Bit Greyscale Delay* OUT15 Register 180 Register191 PWM Control x15 Dot Correction 6-Bit Dot 22 90 Register 95 Correction XERR Open&Short LED Detection 30 23 AS1112 GND SDO * not for AS1112C www.austriamicrosystems.com/LED-Driver-ICs/AS1112 Revision 1.13 1 - 19 ams AG Technical content still valid